(1) Select the potentiometer according to the use requirements

　　When selecting a potentiometer, the resistor body material, structure, type, specifications and adjustment method of the potentiometer should be selected according to the specific requirements of the application circuit.

For example, high-power wire-wound potentiometers are used for high-power circuits; high-precision wire-wound potentiometers, precision multi-turn potentiometers or metal glass glaze potentiometers should be used in precision instruments and other circuits; carbon film potentiometers can be used for medium and high-frequency circuits ; The volume adjustment and power switch of the semiconductor radio can be selected with a small carbon film potentiometer with a rotary switch; the volume control of the stereo audio amplifier can be selected with dual together with the shaft potentiometer; the tone control of the audio system can be selected with a straight slide potentiometer; The reference voltage of the power circuit should be adjusted with a fine-tuning potentiometer; the potentiometers used in communication equipment and computers can be patch multi-turn potentiometers or single-turn potentiometers.

 

　　 (2) Reasonably select the electrical parameters of the potentiometer

 

After selecting the type and specifications of the potentiometer according to the requirements of the equipment and the circuit, the electrical parameters of the potentiometer should also be reasonably selected according to the requirements of the circuit, including rated power, nominal resistance, allowable deviation, resolution, maximum working voltage, dynamic Noise, etc.

 

　　 (3) Select the potentiometer according to the change rule of resistance

 

　　Various potentiometers for voltage adjustment in various power circuits, working point adjustment of the amplifying circuit, sub-brightness adjustment, and line and field scan signal adjustment should all use linear potentiometers.

　　The potentiometer for tone control in audio equipment should use reverse logarithmic (formerly exponential) potentiometer, and the volume control potentiometer can use logarithmic potentiometer.

 

What is the difference between sliding rheostat and variable value resistor and fixed value resistor

Sliding varistor: The resistance of the connected circuit can be changed by changing the number of turns of the resistance wire of the access circuit, and the resistance value of the connected resistance can be continuously changed (to be precise, the resistance of one turn of the resistance wire is the smallest change unit to change) , The resistance value of the access circuit cannot be read from the varistor.

Variable value rheostat: Also known as resistance box, the resistance of the access circuit can be changed by changing the fixed resistance of the access circuit. The resistance value of the access circuit cannot be continuously changed. The access circuit can be read from the scale on the surface of the resistance box Resistance.

Fixed value resistor: a resistor with a fixed resistance, the general resistance does not change after being connected to the circuit.

N types of potentiometers

　　 Potentiometers are actually potentiometers, which is what the general factories and purchasers say.

　　Potentiometer, Taiwan people like to call VR, Hong Kong people call it: Turbo. As for foreigners, it can only be called: potentiometer. There are still many people

Called: adjustable resistance, because the potentiometer is a resistor that can adjust the volume, so it is called adjustable resistance for short. It is also called: fine-tuning, the principle is the same.

　　 Of course, there are still many subdivisions of potentiometers. Like our rotary potentiometer with dial, customers like to call it: dial potentiometer, or dial potentiometer. This is called according to shape. It is also called according to the action state of the potentiometer: the straight sliding potentiometer or sliding potentiometer is because the walking track of the potentiometer is sliding, and the rotating potentiometer is because the working track of the potentiometer is rotating. . . . .